As a member of the international team of scientists, researchers at the South Ural State University in Russia have synthesized ceramic materials suitable for manufacturing pressure, temperature, electric and magnetic field sensors. The material is more environment-friendly and belongs to multiferroic alloy.
Environmental protection sensor materials
The latest research in the field of materials science aims to study the properties and structure of multiferroic materials. These materials have both magnetic and electrical properties, so their electrical properties can be controlled by magnetic action, and vice versa.
For large-scale production, the main goal today is to find a cheap and convenient material, which has magnetoelectric interaction, polarization and magnetization, while meeting environmental standards. Many modern materials contain lead, but its wide use will cause environmental pollution and have a negative impact on human health.
Scientists engaged in modern material development at Southern Ural State University believe that ceramics based on bismuth ferrite can meet modern requirements. The preparation of materials in the form of ceramics makes it possible to synthesize various chemically substituted compositions with starting ions relatively quickly, and evaluate the effect of chemical substitution on the structure and properties of this material.
The research team composed of Susu Dmitry Karpinski, Sergey trukhanov and Alexei trukhanov studied the structural phase transition of BiFeO3-BaTiO3 ceramics by using bismuth ferrite (BiFeO3), one of the most promising multiferroic compounds, instead of iron and bismuth ions, It is found that how the properties of materials change according to the type of structural deformation. The data obtained will allow the development of new functional materials based on complex oxide systems.
“We use innovative chemical alternatives to synthesize materials. The choice of chemical composition makes it possible to synthesize ceramic components with so-called metastable structure. These materials are highly sensitive to external factors (such as temperature, potential and temperature), magnetic field and pressure. In other words, they can be used as sensors of external influence “, explained Dmitry karpinsky, a senior researcher in the Department of material science, physics and chemical properties of materials (School of material science and metallurgical engineering, School of engineering and Technology).
The study, together with scientists from Susu, was attended by representatives of the Urals Federal University, Rhodes University of Technology (Poland) and awero University (Portugal). In foreign scientific centers, experiments such as studying the structure of material components by electron and atomic force microscopy have been carried out. Susu analyzed the structure of the composition by X-ray diffraction.
From bulk ceramics to thin films
At the end of the study, scientists revealed the relationship between the type and size of structural distortion depending on the concentration of alternative ions. It determines the piezoelectric properties (polarization of the material under mechanical stress). Data in various temperature and substituted ion concentration ranges were obtained. According to the obtained results, a phase diagram is made.
“After selecting the best equivalent scheme and comprehensively analyzing the structure and properties of the obtained materials, work will be carried out to obtain the known chemical composition in the form of film, because this form of materials is needed in most cases. Of course, it is too early to talk about mass production, but as part of the technical development, we plan to obtain the test batch of materials, This will enable us to evaluate the market prospect of this material. And the scalability of this synthesis technology, “Dmitry karpinsky added.
The materials synthesized by scientists can be used to manufacture sensors for external factors and magnetostrictive and piezoelectric components.